Artificial tooth.



E. B. FEWELL.

ARTIFICIAL TOOTH.

APPLICATION FILED FEB. 11. I915.

Patented Oct. 5, 1915.

Attorneys Madisom.

snares rairnrrr iiih i imfi.

EVERETT FEEVELL OIF MADISON, INDIANA.

ARTIFICIAL TOOTH.

: To all whom it may concern Be it known that I, Evnnn'rr B. FnwnLL a citizen of the United States, residing at in the county of which the fol- .latent No. 1,078,844, granted on the 18th day'of November, 1913.

I the structure shown In my prior patent above alluded to, the front of the tooth. on its rear face, is provided with a projection and across Section taken at a proper point through the tooth front will sho-wno less than four surfaces which must be accurately and carefully prepared, a construction which those skilled in the art will recognize at once as being difficult of attainment in. practice. Further. in in my prior patent,

relative longitudinal movement in one disembled with the insert rection between the front of the tooth and the rear portion or backing thereof is pre vented by an undercut, transverse shoulder on the front. The front ordinarily is fashioned from porcelain. and it hasbeen found difficult to produce a porcelain front'the undercut transverse shoulder of which will be suiiiciently accurate in' configuration to serve the ends in-view.

One object of the present inventionytherefore. is to overcome the difficulties above mentioned.

Specifically. the present invention aims to provide a tooth front having a longitudinal bore, a portion of which is adapted to coiiperate in a novel manner with an insert and with a backing. to prevent relative longitudinal movement between these parts in one direction. aportion of the bore beingadaptcd to receive'the connecting ele ment whereby the. front of the tooth is as and with the back. of the invention to and to enhance the util tis' within the scope improve generally ity of devices of present invention ith. the which will ceeds. the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that appertains. above and other ol') ects in view Specification of Letters Patent.

of'Jefl' erson and State of Indiana, have invented a new and an artificial tooth and that typeto which the detail in Fig.

appear as the description pro changes in the precise embodiment of the invention herein within the scope of what is claimed, without departing from the spirit of the invention.

Patented net. 5. lists. Application filed February 17,1915. Serial No. esie.

disclosed can be made In the accompanying"drawings:-Fignre 1 shows in longitudinal section a tooth constf ucted in accordance with the present invention; Fig. 2 is a perspective showing the insert; Fign3 is aperspective of the tooth front; Fig.4 is a perspective of the insert, the insert being reversed from the position of figure; Fig. 5 is a longitudinal section of the front of the tooth; Fig] 6 1s a longitudinal section of the front of the at right angles to f 5; Fig. 7 is a lontoot-h taken in a plane the cutting plane of'Fig. git-udinal section showing a modification; Fig. 8 is a longitudinal section'sho'wing a modification; Fig. 9 a perspective of the front as used in connection withiflthat form of the invention which is disclosed i-n'Fig. 8. .ln carrying out the present invention there is provided a front 1 shown in detail in porcelain. The rear of the front 1 is provided with a transverse shoulder 2 above which is located a flat rear face 8. Below the shoulder 2 is located a' rear face 9 which is approximately parallel to the face 8. Below the face 9, the front 1 is provided with an inclined rearface edge of the tooth. In the front 1 is formed a longitudinal passage denoted generally by the numeral 4. That end 501 the passage 4 which adjacent the cutting edge of "the tooth is of comparatively small diameter, whereas that end 6 of the passage adjacent the base of the tooth is of larger diameter F 1g. '3 and preferably fashioned from' 3 defining the cutting theshank 7 of the tooth. It served. that the rea r the tooth intersects the passage adjacent the baseof the tooth so thatthe portion 6 of the passage is open, as Fig. 3 will clearly disclose.

In combination scribed there is employed an insert shown in is to be obbody portion 1 0 fitting against the face 9,of

the insert. an inclined flange 11 cooperating with' the passage 4,.a gages the shoulder 2 on the front 1,a'1ip 15 which engages the face 8 of-the front 1, and

1e insert comprises a face 8 of the front 1 of with the front 1 above dea forwardly presented trough-lilac socket it fitting in the part 6 of the in the front 1, the socket l oemhodying a project ingend 4-0 which engages behind the shoul- 5 der 2 of the front.

The insert above described preferably is fashioned from goldand is swaged into the; shape shown in 2 and l, to conform to the rear face of the front 1.

After the insert has been fashioned in the manner above described, a. backing 17 is built up on the insert, the backing if desired being made of gold solder or any other suitable material. This backing conforms of course to the general outlet of the insert and emhodies an extension or lug 18, indicated in Fig. 1 and filling the trough-shaped socket 16 of the insert.

After the backing has been assembled with the insert in the manner hereinbefore described, the insert and the hacking carried thereby applied to the front 1 of the tooth and a securing or connecting device, prefen' ably in the form of a pin 19 is'passedupwardly through an opening 35 in the hacking, through the openin 12 in the insert-" and into the portion 50f the passage, as will be clearly understood from Fig. 1.

From the foregoing description it will be obvious that the porcelain 1 is not over-' heatecl or otherwise damaged during the building .up of the backing; l7,"since the backing is applied to the insert while the insert is, separated from the front.

Especial attention is directed tot-lie mannor in which the extension 18 of the backing and the parts 16l-0 of the insert are lodged in the open portion 6 of the passage on the front 1. Owing to the cooperation between the parts shove mentioned, relative trans verse movement between the front 1 on the one hand and the backing 17 and the insert upon the other hand is prevented. Further, aswill be obvious, longitudinal movement between the parts in one direction is prevented by the construction above outlined, longitudinal movement in anogposite direction being prove ted bythe pin or securing element 19. Further, it to be observed, referring specifically to 3, that the rear face of the "front 1 is extremely simple and presents a; "pin 'ality ofsuriaces which-may be fashioned readily without complicated grinding operations.

in the modification shown in Fig. 7, the parts remain substantially as above described, The front is shown at 20 and the backing appears at 21, the connecting pin being shown at 22. In this form of the in- 6 vcntion, however, an opening 23 is made in shown at 26 and the passage therei is n'eans comprising an extension em;

large diameter one end, as she of large diameter at the opposi shown at 28 and of a smaller diamw terinediate its ends as shown at 29. ner end of the portion .28 or the jf forms a shoulder 30 against which shuts end of an insert or tongue 31 carried in plate 25. A securing pin 32 is lodge the portion 29'of the passage and the head end 33 of the pin engages the end of the insert or tongue 33. In forming the plate 2o,'the same is provided with a forwardly extended lug or projection which 30 operates with the portion 27 of the pas sage in the tooth front 26 as does the par 16 and 18 of Fig. 1. Having thus described the i.nvention,wl

is claimed is 2- 1. As an article of manufactiiu'e, a front having a longitudinal portion of the rear face of the front hei set forwardly to intersect the through a portion of its length and to r the passage, another portion of of the front being inclined to intersect passage. f.

In a device of the class descril" front having a longitudinalpassage, tion of the rear face of the front being; forward y to intersect the passage and open the same adjacent the base of the too backing means'comprising a transverse. tension engaged in the open portion of passage; and a securing device entering: passage adjacent the working end oi front and engaged with the bachng m ans.

3. In a device of the class described front having a longitudinal passage, a L tion of the rear face oi the front bein' forwardly to intersect the passage, the having a shoulder which extends across passage intermediate its ends and a l.

the open portion of the passage, one end oi the extension terminating in a projection lodged behind the shoulder.

In testimony that I claim the foregoing as my own, I have hereto allixed my .zigna ture in the presence of two witnesses.

EVERETT l3. l l lNl lliL. Witnesses:

IVY E. SIMPSON,

Prnnoarnxa A. llocnntm'. 

